[PATCH v3 4/6] ASoC: simple-card-utils: Set sysclk on all components

[Robert Hancock]

If an mclk-fs value was provided in the device tree configuration, the
calculated MCLK was fed into the downstream codec DAI and CPU DAI,
however set_sysclk was not being called on the platform device. Some
platform devices such as the Xilinx Audio Formatter need to know the MCLK
as well.

Call snd_soc_component_set_sysclk on each component in the stream to set
the proper sysclk value in addition to the existing call of
snd_soc_dai_set_sysclk on the codec DAI and CPU DAI. This may end up
resulting in redundant calls if one of the snd_soc_dai_set_sysclk calls
ends up calling snd_soc_component_set_sysclk itself, but that isn't
expected to cause any significant harm.

Fixes: f48dcbb6d47d ("ASoC: simple-card-utils: share asoc_simple_hw_param()")
Signed-off-by: Robert Hancock <robert.hancock at calian.com>
---
 sound/soc/generic/simple-card-utils.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index a81323d1691d..9736102e6808 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -275,6 +275,7 @@ int asoc_simple_hw_params(struct snd_pcm_substream *substream,
 		mclk_fs = props->mclk_fs;
 
 	if (mclk_fs) {
+		struct snd_soc_component *component;
 		mclk = params_rate(params) * mclk_fs;
 
 		for_each_prop_dai_codec(props, i, pdai) {
@@ -282,16 +283,30 @@ int asoc_simple_hw_params(struct snd_pcm_substream *substream,
 			if (ret < 0)
 				return ret;
 		}
+
 		for_each_prop_dai_cpu(props, i, pdai) {
 			ret = asoc_simple_set_clk_rate(pdai, mclk);
 			if (ret < 0)
 				return ret;
 		}
+
+		/* Ensure sysclk is set on all components in case any
+		 * (such as platform components) are missed by calls to
+		 * snd_soc_dai_set_sysclk.
+		 */
+		for_each_rtd_components(rtd, i, component) {
+			ret = snd_soc_component_set_sysclk(component, 0, 0,
+							   mclk, SND_SOC_CLOCK_IN);
+			if (ret && ret != -ENOTSUPP)
+				return ret;
+		}
+
 		for_each_rtd_codec_dais(rtd, i, sdai) {
 			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, SND_SOC_CLOCK_IN);
 			if (ret && ret != -ENOTSUPP)
 				return ret;
 		}
+
 		for_each_rtd_cpu_dais(rtd, i, sdai) {
 			ret = snd_soc_dai_set_sysclk(sdai, 0, mclk, SND_SOC_CLOCK_OUT);
 			if (ret && ret != -ENOTSUPP)
-- 
2.31.1